TDS检测电路探讨

The Discussion of TDS Detection Circuit

本文提出一种TDS检测电路的方案。MCU不同的输出口输出不同频率的正反向电压,随着频率的变化,水的阻抗也发生变化,检测电路可以得到不同的采样值,通过计算可以消除电容效应得出精确的TDS值。此种方法实现简单,不存在理论误差,并且可以控制输出频率及对应的采样时间。

A new method of detecting TDS method is introduced.The MCU I/Os can output the positive or negative voltage of different frequency.Along with the change of frequency,the impedance of water is also changed,and at the same time the detection circuit can get different sample values.By calculating,the capacitance effect can be eliminated and we can get the exact value of TDS.This method is simple to implement and has no theoretical error.The MCU can control the frequency of output and the corresponding sampling time.